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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4f4cbbaaf9184b20dc2eee2d5b0f0046a964df59e9067de9507146ac860d56' 
  AND token = 'Bzd8S+TQ5qdhNGjooK+YQ22QBgWiXQsAzO5/KhnwUk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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