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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e66eef4e59ca403735634de274acddfd57dd804f75ac7187e8920c16edadf43' 
  AND token = 'wWkasIvk10uflBqRSofFW+rTm4B5NZ0W5iOaTGuvF/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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