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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea420f5af01175c29945d579109717392a45d1333ac438b871968e6a245ee61' 
  AND token = '6XmQtrdYumjL2Lsls/q7IUGMHG1O4Nspis6/iKPpyos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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