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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec0fdae396f6d08bd4e611b66380a83c89cb8c15b71b5030bab7daa883560da' 
  AND token = 'OCt7RE+D27AuWpjj3pGrMBhb2NWl2h8IuXAGR/EWGfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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