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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167d9bbbdde9f7bd1307b82ddd5c336f38904eb113dd1a33d2126c9d1be1f30f' 
  AND token = 'tF7xoY0jfHVlPxUqDVGgN9T47uBJj1Lhdx7p/rTUTlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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