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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a8dddf8eb6d5b69ad8069c56a683633e45cf699a8d39724d383e58876bb15a' 
  AND token = 'G4GjIXjcaaS4j7EVWDKz00wfKowMxzoXPO//kvHQuNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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