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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd089c005579cc576478454105a0cfdf5b9095dbe28c8cc58d11c94b70696e70a' 
  AND token = '0bgtgBxL13t+4hQ+v6cQ3mU/80GyGltxGd89MUyf3aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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