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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f70066b96a53097d6b80e80f34eeb53aebeae05b7f414f16b87d64ddc2d539' 
  AND token = '+9ifWoliLxJLygKVdwf1q3czesvhXJ2ukiu1b2dH6e0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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