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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b79523ddc3c114d26dc63bcc1377edcece219bbc4daa27f6d5754c79dfea846' 
  AND token = 'fap3w6C3XYq2rGOdjGn6wD/JZL1H89nwPb9IaVkx64U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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