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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cf139e68ff1833a1edc6847daca712ac2424f5ac009c8bba24645ec7c7be74' 
  AND token = 'Xte/26Znh9ZIbHFkb5rsr1cOBIJD+ZURK2ec8PKQjYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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