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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15173d1938ae97502e6ddeb9fd844a2898f8e716e2748b425795e32b130a5dbc' 
  AND token = 'agL5xATW4PeXhpjDWZJd2xqEc/kMIlDqm3T/63ifm1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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