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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a385fb6ba47639628064160dec65147652f8c0af7a2eadf8bd43d0468d1340cb' 
  AND token = '1OVYeUyyJhRM8JkhfEiTK9Q4ZR3915E9/58sLHun3wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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