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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13b6f0399d57006405c2bb99d931caf49ad64a74087af5f0d3dec63f0c007f3' 
  AND token = 'fH9gxIjzlcl6atsIC91BQdxHWhBTTZnWt5Z8SRyfjK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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