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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f70fccfcadeeb8c439cbeb913e93d22ec24cc52f740ad337ba3883f479accfa' 
  AND token = '5IM1pJWJH98UBf8u6BhklwjGu8EIam+1eyunOyGN7fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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