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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f298bfac6fb6eefea473cdce0c9c0f6d016134e5cc129cef7357ea35218daf' 
  AND token = 'iMCAmZFc+KBEQ12ehB9l2fSwDQP9X7PPdHDXmj5fBJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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