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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9627fee634e9cd77eca4ee50b9523bb8f74e8635749dd762b09b339e877a510' 
  AND token = '1eidyd+vCMxYnr39kufMoL/i1qKBLsF5Mr7Gk7LeIOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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