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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7e412f959261cc9123fd51fe6b152b8b53f4c85efd7624a0e60fefe2c9076f' 
  AND token = '/cuOpGwEs5QOic93uJvbBF2cadZp+9KtAWKaV/iOtJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}