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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70282e694e7183ab9f175faba66e23c66f882484ba3db2b467cb984d044645e3' 
  AND token = '88sl1OZu3Ey/t5ma48O1PgPXbu3Zi+K/qt6LTvyBxjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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