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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '915ea5ffb4b4d92721ec1f5b227febefe9ca30e699f7a07da429e9678ebb4d63' 
  AND token = '5GoLwg23EyCWiTDw7omOXNQZop7UaxGlbkycxhe0He0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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