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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492b01885548c9ecb2d978b81f7ddd70ff6e7eec446201e46851b694bdd54cfd' 
  AND token = 'iT1tB1im9h99t5N28Z+GiRDy9kIVC3/qFplaSxlZmAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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