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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3608f60382be9db9850ef6350f59a55428da5ae0399491dba09f8a4a2fd3884' 
  AND token = 'izKnqd1EL1O/ywly4jG7C1vNnRtBlLhcFidQj+j15vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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