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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ab253fa47b16ea6b581a6935e1ce7c057ae44f0dbd7d4e35728abd87a80454' 
  AND token = 'BzRbWgr1zIsJv/ctwfypl4LSRsNUesCnsqqovEdP15E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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