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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03250173e4839b5846d7778d64120b9b017513e143c8af05648bd3d93e79d94' 
  AND token = '/4JQ2XEkre4Gi2lY5PnKtIoUyu52JH6g2AulbHARQVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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