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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0688642953311dad43c938ed6e1880272156014ff55e748cd24ba9d9f1599e7' 
  AND token = 'a26ROfdjtmfnYUBC96GV6lJt9HHaknAhrPM+Sychcn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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