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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd976ba9ddc7126745c8f2f1dd1aca2c32654d6ea5c9f97268f2e2ae7daa1f72d' 
  AND token = 'j2eutjTx9d6ebyWcW1J5pumpcgRGcb36wYNB8vDBc1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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