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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89172268cf69544c2242638835564fd8861016b1de9a63897422cd443ca8c2b2' 
  AND token = '6cwKMIVa9bIHQYy2nze/62Wm/JbxebDth3g5Sq5l3Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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