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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c702cd89b9ac7827d70ccb095417ae6993bddb5ae7dab32fbc9e135c20af134' 
  AND token = 'Ap3Sr8t9SeAaCiT7wsQ8MXoQrONkFY5ZyhIk4AT3F5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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