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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b756ab37111823ae8a588020dda82c9ef2275c697a1eb438a9c5c9f2956d28bc' 
  AND token = '87SlrRyKLZoiJbkJz8V1A3E5oFz70ZgMmwtGP/32WLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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