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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aedff7aa6fec170eaabbeae432f7496be66f7b401f082f47e0c43908cdd792dd' 
  AND token = 'l0Qg8XHG/oC0zxyOtgVfMwqG77PQBD+ieuEtqEXGknI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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