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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e6bf108ed8ac281bf4b49cddfb94e03c28479b8aa37a26e639021dfd4f3652' 
  AND token = '8L1NkTi/q/blb5I1dWP7Ne48z+1IyGRgOwWhMBmzsXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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