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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce1ef862f02dfa7218c1a36c4ea998c43ee8f39196521298b18fa2e693f6a0a' 
  AND token = '3wkAlFOugyJFq8alegMTy5vHavXU1KO0aUdvdaQjeWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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