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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7b7d555e57f08f8310a94346da4f2a7f4c1d74b7070b433266c01abbd555c2' 
  AND token = 'nM6F0jUHvetlOhLVe35W4csZ7BkvE1eKF/V8vaX3IYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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