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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3d0a8a4bf22adba7401ceb3dccba9dd5a12120d999d854943b4cdd06f4e7f23' 
  AND token = 'LulKZseRM/rpGW5crEDHHt0moe4Jo+mPn18J7g2FkL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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