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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54aef99b4f83e9cf631ab0ef33c22e14ea63571981b70065870223683ebfaef0' 
  AND token = 'm8Ny8ZxdH8q3TBj12rpLl/ORb9Zo8wxk9Y/L0MEAW3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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