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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c889f5f7e202b491666c636eca0f7ee8aaa624fb133377497097e7f3b80fa21f' 
  AND token = '+91ebG2pnYbpmvuut7nEL2zwEpLxdc/TOW9A9bXKKQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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