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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e5e4414c96c1862f41b34a769a7bea3757b12b872021765dc31a74ab880c4e' 
  AND token = '8FcbuYwpi4MdTK9Uv0vsnP5rOV16YqnhoN7fXo6o2fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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