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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c3580c8f9af49af19f7c752c4cc056ca6046f2454819ae321575cf770f82f28' 
  AND token = 'Z/yNan8Bp5fll2kidx7r+Z7k0jTT/BkNyoMxokt+MUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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