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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b3f22d5e9b8c2be4cbfc5fb7de4983d1380f516a91b9e5147ffc9d20bc1d3f' 
  AND token = 'YHebkynzuJr3bJiR58tWMV6/UV0a9sANyPZPdO85N6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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