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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daa56bcbc4d7f791842ba3147457470475d56709e1011b30af1a4947712d16bb' 
  AND token = 'CN6GDzXbbQhvqRuZc+hn2f90IKWSPW3BRENliSjM49s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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