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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d19538c079d72ffaf56f9c0877234743233bd266c3d32187f827c206e3e7f8' 
  AND token = '+YF+H5/7VJQ0GB3geyepSI8P4hp5VZU3cIMezZ51EH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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