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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003302077948ea47637571ac062fffd53f1e87714d6a10ba7e2ef285927d5165' 
  AND token = 'W3x+boeBeV/b5eaLcy2YDyWPeD8OTisqam1wIxs73BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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