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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b48905d6da23cab0004a5ac055edbb15d92e0e58828f2b21804fb3c7b3018f35' 
  AND token = 'x61WKfuJprczHuFNHSAAN2m41ea6I5G37McPURrQEr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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