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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ceee9470343bc7f15ab68d56eca84683989729a07912b21d26a4893e45949ec' 
  AND token = 'LuDpf4k44e1GNzhAAnCczC/a+JkIfAFPIdkcJ9snGEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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