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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801ace8ef5a86149d19d2cbe3045945e0a2ecf04f72e0d552896b48346095293' 
  AND token = '3ZVe0uPgJ/dAhVqj/0m0VyGV5pePR6Cgqu84oQgymGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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