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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cddaf29c2bc34fbb335fa5cd2f4985b6ec5fc723aca47536db32e546b7c2d3' 
  AND token = 'edgV9rLC75OZrKsmCqlUxJc9T83od7xoeE7SZQvkj58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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