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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1471edde554f8074a67ba8c0abb8e1b0c719689699da89b6351ee31515be94de' 
  AND token = 'U6ggWPJy6k9db0r5cRmJDESSmoKFBfSSxq6j8h1D19E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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