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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e4f57c6bc4d9ce35c9d842250abb6e36f83f6cce3c40b2080cc43784dff92f' 
  AND token = 'JU6BHTb55qNXy/V8NIih6JvvUZJr0aI7e/rkFTupy3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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