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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa05677f262e4b5d845949f7703a7668cc8300925bee273b6e2110c796204abf' 
  AND token = 'NfzIDDR+YfwokBVWGBUNkRudE7YldYPI+mz9ef9P8MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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