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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b660c602eef8518b4e69a60d54e813da45fa197f94a111a18d17139654ce67c' 
  AND token = '9kQzlCdmABN5vWjTRk8xUn9yntoQeqyIPN7ozrqo7rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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