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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3e455d23aa98f4ae1134a6e808c313fe2d6f667064996b8235866cfb36d9a9' 
  AND token = 'UrnKAFRD71xP2t7zO1wntnfDyh6eibk2tea5Te5nyJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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