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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e962c6fc45b346a962b90f5ea09ea3ec3b7125510d46534470083b9f4b07155e' 
  AND token = 'D5Qta1KRvHHUlJa464JN4mk2Yf4PP0rvKsSDS7LUWrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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