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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '407d50780ab8c85e35574e4a23c5e0ed8c9f690a80835c4fbbebce247f2381ad' 
  AND token = 'MDH51Xky29WQ5oZ1ctjp5S+wrcWmfyQpThAuo1GFBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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