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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62c04be347e1f302ad7b2ef401f53c78c84212d32e67d98e4a9f9a4a4f302ac7' 
  AND token = '6NmQHUNaD+fp4iK0hZ8j3ZTGzWGQ2c7R8ghoaaxlzag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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