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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acdee94167e6cafe4657948c018f5ff92937ea269a285fff613eea8c7a7e5d1' 
  AND token = 'RbpPl2ExxtoxPXHe2sPI0ErIGHxqQ0IPIB2FLna+b+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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