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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30115544692e0813867faad301bbfc6e3ad79d9b3b2daacede0b258c6113c7b' 
  AND token = 'J15GmTiObC/uOHuMmRpcrOZOENiCgF+RXyHFkdcp2qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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